LPF (M) type gas box pulse bag dust collector is a newly developed bag dust collector with high efficiency. Using anti-static filter material, the body has explosion-proof structure, equipped with overtemperature alarm, and can automatically open the cold air butterfly valve into the cold air to reduce the temperature, suitable for pulverized coal preparation system and flammable and explosive dust collection. It adopts the scientific method of offline dust removal to prevent the "readsorption" phenomenon of dust after dust removal, and has the characteristics of large dust removal energy, good dust removal effect, low system resistance, long service life of filter bag and high dust removal efficiency. The whole machine is automatically controlled by PLC, and the parameters can be adjusted according to the process change.